Dating in 1990 2016

Last month, the BBC explained how love has changed over the years. Future spouses could be found living around the corner.

Another about how the average age at which people get married has evolved (it has, as you probably know, been creeping upwards for some time).

And there was this, an eye-catching display of dating data, and arguably the most interesting of the lot: The chart, which comes from a longitudinal study by sociologist Michael Rosenfeld, says a lot about how romance has evolved over the past 60 some odd years.

It shows the rise of online dating (which has only been more pronounced for same-sex couples), clearly depicted by the darker of the two blue lines above (notice not only its furious ascent, but also its relative importance—more than 20 percent of straight couples reported meeting their partners online in 2009, the most recent year for which data are available).

It underscores the outsized role of friends, who historically have been and still are the likeliest avenue to eventual significant others.

But Rosenfeld's data also says a lot about how much life has changed over the same period.

It speaks to the weakening of America's religious backbone, which has lost influence with each passing generation.

A recent survey by the Pew Research Center chronicles this decline, showing that more than half of Americans born in the 1930s and 1940s attend religious services at least once a week, while only about a quarter of those born in the 1980s and 1990s (the ones we adoringly call millennials) visit religious institutions that often.

Couple that with online dating, where the still large but shrinking religious demographic can filter out those less God fearing, and it's no wonder the church has become such an irrelevant matchmaker. Over time, however, that number has only shot up, reaching 81 percent in 2010.

It reflects the urbanization of society, which has inflated the role of bars and restaurants in courtship (see that red line? In 1940, only about 57 percent of the population lived in cities, according to U. More people living in smaller geographic areas means we're all brushing up against strangers more often—and what better place for that to happen than at an establishment that serves booze?

The same shift to densely populated urban areas has left many of the institutions that once defined, or at least (wink wink) heavily influenced, our romantic decisions behind.

The most notable is the collapse of family in this regard, which once played the largest role in societal matchmaking—"connecting young people with potential opposite-sex, same-race, and same-religion partners has always been one of the core functions of the family," Rosenfeld wrote in a 2012 paper.

The declining influence comes in large part thanks to the diminishing need for one's parents (or their friends) to play cupid, but also speaks to the blurring of once rigid class borders.